6Y0C

Influenza C virus polymerase in complex with human ANP32A - Subclass 2


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Host ANP32A mediates the assembly of the influenza virus replicase.

Carrique, L.Fan, H.Walker, A.P.Keown, J.R.Sharps, J.Staller, E.Barclay, W.S.Fodor, E.Grimes, J.M.

(2020) Nature 587: 638-643

  • DOI: https://doi.org/10.1038/s41586-020-2927-z
  • Primary Citation of Related Structures:  
    6XZD, 6XZG, 6XZP, 6XZQ, 6XZR, 6Y0C

  • PubMed Abstract: 

    Aquatic birds represent a vast reservoir from which new pandemic influenza A viruses can emerge 1 . Influenza viruses contain a negative-sense segmented RNA genome that is transcribed and replicated by the viral heterotrimeric RNA polymerase (FluPol) in the context of viral ribonucleoprotein complexes 2,3 . RNA polymerases of avian influenza A viruses (FluPolA) replicate viral RNA inefficiently in human cells because of species-specific differences in acidic nuclear phosphoprotein 32 (ANP32), a family of essential host proteins for FluPol activity 4 . Host-adaptive mutations, particularly a glutamic-acid-to-lysine mutation at amino acid residue 627 (E627K) in the 627 domain of the PB2 subunit, enable avian FluPolA to overcome this restriction and efficiently replicate viral RNA in the presence of human ANP32 proteins. However, the molecular mechanisms of genome replication and the interplay with ANP32 proteins remain largely unknown. Here we report cryo-electron microscopy structures of influenza C virus polymerase (FluPolC) in complex with human and chicken ANP32A. In both structures, two FluPolC molecules form an asymmetric dimer bridged by the N-terminal leucine-rich repeat domain of ANP32A. The C-terminal low-complexity acidic region of ANP32A inserts between the two juxtaposed PB2 627 domains of the asymmetric FluPolA dimer, suggesting a mechanism for how the adaptive PB2(E627K) mutation enables the replication of viral RNA in mammalian hosts. We propose that this complex represents a replication platform for the viral RNA genome, in which one of the FluPol molecules acts as a replicase while the other initiates the assembly of the nascent replication product into a viral ribonucleoprotein complex.


  • Organizational Affiliation

    Division of Structural Biology, University of Oxford, Oxford, UK.


Macromolecules

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Polymerase acidic protein709Influenza C virus (C/Johannesburg/1/66)Mutation(s): 0 
Gene Names: PAP3
EC: 3.1
UniProt
Find proteins for Q9IMP5 (Influenza C virus (strain C/Johannesburg/1/1966))
Explore Q9IMP5 
Go to UniProtKB:  Q9IMP5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9IMP5
Sequence Annotations
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  • Reference Sequence
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
RNA-directed RNA polymerase catalytic subunit754Influenza C virus (C/Johannesburg/1/66)Mutation(s): 0 
Gene Names: PB1
EC: 2.7.7.48
UniProt
Find proteins for Q9IMP4 (Influenza C virus (strain C/Johannesburg/1/1966))
Explore Q9IMP4 
Go to UniProtKB:  Q9IMP4
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9IMP4
Sequence Annotations
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  • Reference Sequence
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
Polymerase basic protein 2920Influenza C virus (C/Johannesburg/1/66)Mutation(s): 0 
Gene Names: PB2
UniProt
Find proteins for Q9IMP3 (Influenza C virus (strain C/Johannesburg/1/1966))
Explore Q9IMP3 
Go to UniProtKB:  Q9IMP3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ9IMP3
Sequence Annotations
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  • Reference Sequence
Find similar nucleic acids by:  (by identity cutoff)  |  3D Structure
Entity ID: 4
MoleculeChains LengthOrganismImage
RNA (5'-R(*AP*GP*UP*AP*GP*AP*AP*AP*CP*AP*AP*GP*GP*GP*CP*CP*UP*UP*UP*U)-3')D [auth IN1]47Influenza A virus (A/nt/60/1968(H3N2))
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.20 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.1

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Wellcome TrustUnited Kingdom200835/Z/16/Z
Medical Research Council (MRC, United Kingdom)United KingdomMR/R009945/1
Medical Research Council (MRC, United Kingdom)United KingdomMR/K000241/1

Revision History  (Full details and data files)

  • Version 1.0: 2020-11-25
    Type: Initial release
  • Version 1.1: 2021-06-16
    Changes: Database references
  • Version 1.2: 2024-05-22
    Changes: Data collection, Database references